OnlineBankFinder.co.uk's Caernarfon Bank page, We have listed several banks in Caernarfon. If you know of a bank in Caernarfon that we missed please submit it at our: Listings Page. The listings below will help you find local banks, bank phone numbers, bank fax numbers, bank maps and local banks in Caernarfon. Online Bank Finder will help you find all banks in Caernarfon.